CVE-2026-31657

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-31657
In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b Patch
https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f Patch
https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35 Patch
https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd Patch
https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2 Patch
https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.5:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
History

27 Apr 2026, 20:16

Type Values Removed Values Added
CWE CWE-476
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.5:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b - () https://git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b - Patch
References () https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f - () https://git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f - Patch
References () https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35 - () https://git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35 - Patch
References () https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd - () https://git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd - Patch
References () https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2 - () https://git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2 - Patch
References () https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96 - () https://git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96 - Patch

27 Apr 2026, 15:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.8

24 Apr 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-24 15:16

Updated : 2026-04-27 20:16

NVD link : CVE-2026-31657

Mitre link : CVE-2026-31657

CVE.ORG link : CVE-2026-31657

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference